Astronomy:WD 0806-661

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Coordinates: Sky map 08h 06m 53.736s, −66° 18′ 16.74″

WD 0806-661
Observation data
Equinox J2000.0]] (ICRS)
Constellation Volans
Right ascension  08h 06m 53.736s[1]
Declination −66° 18′ 16.74″[1]
Characteristics
Spectral type DQ4.2[2]

[3] / Y?[4][5]

Apparent magnitude (B) 13.74[6] / -
Apparent magnitude (V) 13.71[6] / -
Apparent magnitude (R) 13.64[6] / -
Apparent magnitude (I) 13.60[6] / -
Apparent magnitude (J) 13.704 ± 0.023[1] / >23.9[7]
Apparent magnitude (H) 13.739 ± 0.025[1] / -
Apparent magnitude (K) 13.781 ± 0.043[1] / -
Astrometry
Proper motion (μ) RA: 88.0 ± 2.8[1] mas/yr
Dec.: 139.9 ± 1.3[1] mas/yr
Parallax (π)52.17 ± 1.67[8] mas
Distance63 ± 2 ly
(19.2 ± 0.6 pc)
Absolute magnitude (MV)12.30[6] / -
Details
Component A
Mass0.58 ± 0.03[6] M☉
Surface gravity (log g)8.00 ± 0.05[6] cgs
Temperature10205 ± 390[6] K
Age0.62[6][note 1] Gyr
Component B
Mass6–9[7] MJup
Temperature300–345[7] K
Position (relative to A)
ComponentB
Angular distance130.2 ± 0.2″ [9]
Position angle104.2 ± 0.2° [9]
Observed separation
(projected)		2500 AU [9]
Other designations
Component A:
BPM 4834, LAWD 27, L 97-3, LTT 3059, NLTT 19008, WD 0806-661, WD 0806-66, GJ 3483, 2MASS J08065373-6618167, GSC 08936-01284, GEN# +6.00204834, uvby98 986097003, WG 12

Component B:
WD 0806-661 B,[9][7] WD 0806-661B,[10] GJ 3483B[4]
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

WD 0806-661 (L 97-3, GJ 3483) is a wide binary system of a white dwarf and a Y-type sub-brown dwarf (designated "B"), located in constellation Volans at 63 light-years from Earth. The companion was discovered in 2011. It has the largest actual (2500 AU) and apparent separation (more than 2 arcminutes) of any known planetary-mass object.

Discovery

Component B was discovered in 2011 with Spitzer Space Telescope. Its discovery paper is Luhman et al., 2011. At the time of its discovery, WD 0806-661 B was the coldest "star" that has ever been found, with a temperature of only 27–80 °C, which is similar to some hot areas of Earth.[9]

See also

Notes

  1. ↑ White-dwarf cooling age, i.e. age as degenerate star (not including main-sequence lifetime).

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "GJ 3483 -- White Dwarf". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=GJ+3483. Retrieved 2012-06-19. 
  2. ↑ Holberg, J. B.; Sion, E. M.; Oswalt, T.; McCook, G. P.; Foran, S.; Subasavage, John P. (2008). "A New Look at the Local White Dwarf Population". The Astronomical Journal 135 (4): 1225–1238. doi:10.1088/0004-6256/135/4/1225. Bibcode: 2008AJ....135.1225H. 
  3. ↑ Sion, Edward M.; Holberg, J. B.; Oswalt, Terry D.; McCook, George P.; Wasatonic, Richard (2009). "The White Dwarfs Within 20 Parsecs of the Sun: Kinematics and Statistics". The Astronomical Journal 138 (6): 1681–1689. doi:10.1088/0004-6256/138/6/1681. Bibcode: 2009AJ....138.1681S. 
  4. ↑ 4.0 4.1 Rodriguez, David R.; Zuckerman, B.; Melis, Carl; Song, Inseok (2011). "The Ultra Cool Brown Dwarf Companion of WD 0806-661B: Age, Mass, and Formation Mechanism". The Astrophysical Journal Letters 732 (2): L29. doi:10.1088/2041-8205/732/2/L29. Bibcode: 2011ApJ...732L..29R. 
  5. ↑ Kirkpatrick, J. D.; Gelino, C. R.; Cushing, M. C.; Mace, G. N.; Griffith, R. L.; Skrutskie, M. F.; Marsh, K. A.; Wright, E. L. et al. (2012). "Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function". The Astrophysical Journal 753 (2): 156. doi:10.1088/0004-637X/753/2/156. Bibcode: 2012ApJ...753..156K. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 Giammichele, N.; Bergeron, P.; Dufour, P. (2012). "Know Your Neighborhood: A Detailed Model Atmosphere Analysis of Nearby White Dwarfs". The Astrophysical Journal Supplement 199 (2): 29. doi:10.1088/0067-0049/199/2/29. Bibcode: 2012ApJS..199...29G. 
  7. ↑ 7.0 7.1 7.2 7.3 Luhman, K. L.; Burgasser, A. J.; Labbé, I.; Saumon, D.; Marley, M. S.; Bochanski, J. J.; Monson, A. J.; Persson, S. E. (2012). "Confirmation of One of the Coldest Known Brown Dwarfs". The Astrophysical Journal 744 (2): 135. doi:10.1088/0004-637X/744/2/135. Bibcode: 2012ApJ...744..135L. 
  8. ↑ Subasavage, J. P.; Jao, W. C.; Henry, T. J.; Bergeron, P.; Dufour, P.; Ianna, P. A.; Costa, E.; Méndez, R. A. (2009). "The Solar Neighborhood. XXI. Parallax Results from the CTIOPI 0.9 m Program: 20 New Members of the 25 Parsec White Dwarf Sample". The Astronomical Journal 137 (6): 4547–4560. doi:10.1088/0004-6256/137/6/4547. Bibcode: 2009AJ....137.4547S. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 Luhman, K. L.; Burgasser, A. J.; Bochanski, J. J. (2011). "Discovery of a Candidate for the Coolest Known Brown Dwarf". The Astrophysical Journal Letters 730 (1): L9. doi:10.1088/2041-8205/730/1/L9. Bibcode: 2011ApJ...730L...9L. 
  10. ↑ "WD 0806-661B -- Brown Dwarf (M<0.08solMass)". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=WD%200806-661b. Retrieved 2012-06-19. 

External links




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